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235*12.1+235*42.2-135*54.3 用简便方法计算
人气:354 ℃ 时间:2020-06-09 00:58:47
解答
=(12.1+42.2)×235-135×54.3
=54.3×235-54.3×135
=(235-135)×54.3
=100×54.3
=5430
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